Nikon D40 Manuel D’Utilisation

Focus lock can be used to change the composition after focusing, making it possible to
focus on a subject that will not be in a focus area in the final composition.  It can also be
used when the autofocus system is unable to focus (  27).  Single or dynamic area AF is rec-
ommended when using focus lock (  24).

The shutter-release button can not be used to lock focus in   mode (  19), continuous
shooting mode (  32), or continuous-servo autofocus (  23), or when continuous-servo
autofocus is selected in auto-servo AF (  23).  Use the AE-L/AF-L button to lock focus.  At
other settings, focus will remain locked between shots if the shutter-release button is kept
pressed halfway.

Shutter-release button/AE-L/AF-L button

1

Focus lock can be used with any focus area.  Position the sub-
ject in the selected focus area (  25) and press the shutter-
release button halfway to initiate focus.

2

Check that the in-focus indicator (z) appears in the view-
finder.  Focus will lock automatically when the in-focus indica-
tor appears, and remain locked while the shutter-release
button is pressed halfway.  Focus can also be locked by press-
ing the AE-L/AF-L button while the shutter-release button is
pressed halfway.  Focus will remain locked while the AE-L/AF-L
button  is  pressed,  even  if  you  later  remove  your  finger  from
the shutter-release button.

3

Recompose the photograph and shoot.

This option controls the behavior of the 

AE-L/AF-L

 button.